Cardinals Turn to Prospect Hjerpe | MLB News

The St. Louis Cardinals are scrambling to patch holes in their starting rotation as both Andre Pallante and Hunter Dobbins sit out with injuries. They’ve called up Quinn Mathews for now, but are eyeing a major league debut for lefty prospect Cooper Hjerpe — ranked 18th on their list — who’s posted a 3.08 ERA in 14 starts this season. After missing all of 2025, Hjerpe’s gradual return could be a crucial boost as the team looks to stabilize the rotation with internal options.

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